Music usually performs a different function to non-fiction books in terms of conveying practical information, but an analogue for a quality reference book could

Music usually performs a different function to non-fiction books in terms of conveying practical information, but an analogue for a quality reference book could be an original composition recorded by a master musician/composer. That recording can be a key tool to a another musician or composer learning her trade, no? Whether the book or recording is digital or not doesn't really matter